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| Written by | Frank Loesser |
| Date | 1950 |
| Source | Guys and Dolls |
| Publisher | Frank Music Corp. |
Wayne and Wanda attempt to sing "I'll Know" in episode 117 of The Muppet Show. Wayne gets distracted by a pretty girl who walks across the stage and chases after her, making Wanda jealous and ending the number.
The song was spoofed in Episode 3623 of Sesame Street, where Humphrey sings about how he'll meet his true love.